It sounds like you either have a faulty switch or a faulty bulb as this is on an unprotected circuit if has blown it will create a short.if the problem is happening when the machine is being stared it will be either a magnetron fault,capacitor shorted or a diode shorted .to check these you will need a multimeter that has a 10 k scale with a 9 volt battery inside,hope this helps regards les

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Related Questions:

If too much current passes through the microwave circuitry, the line fuse will blow. If the line fuse blows, the microwave won't start. To determine if the line fuse is at fault, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. In addition, you should investigate and resolve the problem that caused the fuse to blow. If you don't resolve the underlying issue, the new fuse will blow too. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the line fuse.)

Line
Fuse

Every
microwave oven has a line fuse. This fuse is designed to blow if too
much current is drawn through the microwave circuitry. The fuse can
be replaced, but the underlying issue should still be investigated
and resolved. Otherwise the new fuse will blow also.

Main
Control Board

If
the microwave is not working the main control board may be
defective. This is not common. When a microwave stops working the
problem is usually the line fuse or within the high voltage circuit;
either the high voltage capacitor, diode, transformer or magnetron.

Thermal
Fuse

If
the microwave is not working the thermal fuse may have blown. It can
be tested for continuity. Watch our fuse testing video for more
information.

Thermoprotector

If
the microwave is not working the thermoprotector may have tripped.
This is a safety device to prevent the microwave from overheating. It
can be tested for continuity to see if it's blown.

Every microwave oven has a line fuse. This fuse is designed to blow if too much current is drawn through the microwave circuitry. The fuse can be replaced, but the underlying issue should still be investigated and resolved. Otherwise the new fuse will blow also.Main Control Board

If the microwave is not working the main control board may be defective. This is not common. When a microwave stops working the problem is usually the line fuse or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

Thermal Fuse

If the microwave is not working the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.Thermoprotector

If the microwave is not working the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Every microwave oven has a line fuse. This fuse is designed to blow if too much current is drawn through the microwave circuitry. The fuse can be replaced, but the underlying issue should still be investigated and resolved. Otherwise the new fuse will blow also.Main Control Board

If the microwave is not working the main control board may be defective. This is not common. When a microwave stops working the problem is usually the line fuse or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

Thermal Fuse

If the microwave is not working the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.Thermoprotector

If the microwave is not working the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Every microwave oven has a line fuse. This fuse is designed to blow if too much current is drawn through the microwave circuitry. The fuse can be replaced, but the underlying issue should still be investigated and resolved. Otherwise the new fuse will blow also.Main Control Board

If the microwave is not working the main control board may be defective. This is not common. When a microwave stops working the problem is usually the line fuse or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

Thermal Fuse

If the microwave is not working the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.Thermoprotector

If the microwave is not working the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

There is a fuse found behind the upper grill, it is likely a 20amp fuse.If the fuse has blown, it is likely that the door safety switches need to be replaced.Change the fuse (unplug the micro first) and continue using. If the fuse blows again, have it serviced by a qualified service person.

There is always a fuse inside a microwave.Sometime this has only blown due to a surge,and upon replacing, the microwave will continue working.If it is something worse the fuse will continue to blow.In this case it could very well be the transformer,but there are other possible causes as well.(for example the control board or a short.)

HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))....